Michael mahojst



(No Model.)

M. MAHONY.

FURNACE GRATE.

' No. 346,115. Patented July 27,1886.

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W501?) 4g llLowmmJ UNITED STATES PATENT OFFICE.

MICHAEL MAHONY, OF TROY, NEW YORK.

FURNACE-GRATE.

SPECIFICATION forming part of Letters Patent No. 346,115, dated July 2'7, 1886.

Application filed August 31, 1885. Serial No. 175,749. (No model.)

To all whom it may concern.-

Be it known that I, llIIOHAEL MAHONY, a

citizen of the United States, residing at Troy, in the county of Rensselaer and State of New York, have invented certain new and useful Improvements in Furnace-Grates, of which the following is a specification, reference being bad therein to theaccompanying drawings.

My invention relates to improvements in furnace-grates, in which the grate-bars are pivoted to a frame and capable of vertical oscillation, the arms of each grate-bar interlocking with the arms of the adjacent grate-bar to shake the ashes and grind the clinkers pro duced by the combustion of coal, and the objects of my improvements are to produce a grate-bar suppporing-frame capable of some expansion without buckling, and also to produce grate-bars capable of interlocking with similar series, and presenting a close surface to carry small coal, and having said surface to transversely cut so that it can expand without buckling. I attain these objects by the construction illustrated in the accompanying drawings, in which Figure l is a perspective view of a series of grate-bars connected together and pivoted to a frame constructed in accordance with my invention. Fig. 2 is a top view ofa portion of one of the grate-bars. Fig. 3 is a side view of a portion of the same. Fig. 4 is a vertical section through one of the grate-bars.

Similar letters refer to similar pa rts throughout the several views.

The grate-frame is composed of two side bars, A, and two end bars, B. The side bars have vertical dovetailed groovesain their inner face, and adjoining their ends to receive the dovetailed tenons b, formed on the ends of the bars B. The side bars, A, have journalbearings a to receive thejournaled ends a of the grate-bars G, and caps a to retain said journaled ends. The end bars, B,havein their upper face transverse grooves Z) of sufficient depth to allow the top or hottest portion ofa grate to expand without buckling up out of shape, and ribs 12 surrounding said grooves to strengthen the bars at these points. Projecting from the inner face ofthe bars B are a series of fingers, bito interlock with the arms 0 of the grate-bars.

To permit the central rib C of the grate-bars to expand without distortion, its upper face has grooves 0 cut transversely across it while also retaining a portion of the metal on each side of the arms 0" and of the grooves c to give to the grate as even a face as possible and prevent the lodgement of coal in the interstices, each sectional grate-bar having thus the form of a cross with two long arms and two short ones. To one end of each gratebar 0 is a pendent arm, (1, and the lower end of each arm is pivoted to a horizontal rod, D, to operate all the grate-bars simultaneously. One end of the rod D is in this instance pivoted to one of the branches of a bell-crank lever E,pivoted to a bearing, 6, secured to the frame of the furnace. The opposite branch of the bell-crank lever is tubular and adapted to receive one end of a shaker-rod to oscillate all the grate-bars.

Having now fully described my invention, I claim 1. In a furnacegrate, the combination of the side bars, A, provided with journal bearings a, the end bars,B, provided with slotted pendent ribs b fingers b and transverse grooves I) cut in said ribs and between said fingers, with pivoted grate bars having long straight arms (P, and horizontal grooves c between said arms, substantially as and for the purpose described.

2. The combination, in a furnacegrate, of the side bars, A, provided with journal bearings a, the end bars, B, provided with transverse grooves b, having surrounding ribs 1), and fingers b withthe series of interlocked pivoted grate-bars having long straight arms 0 and horizontalgrooves 0 between said arms and pendent arms d integral with said gratebars, substantially as and for the purpose described.

In testimony whereof I affix my signature in presence of two witnesses.

MICHAEL M AHONY.

Witnesses:

E. W. GREENMA N,

WILLIAM H. MoREIsoN. 

